[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/filesystem/wchmod.cpp

@@ -0,0 +1,45 @@
+//
+// wchmod.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// The _wchmod() function, which changes file attributes.
+//
+#include <corecrt_internal.h>
+#include <io.h>
+#include <sys\stat.h>
+
+
+
+// Changes the mode of a file.  The only supported mode bit is _S_IWRITE, which
+// controls the user write (read-only) attribute of the file.  Returns zero if
+// successful; returns -1 and sets errno and _doserrno on failure.
+extern "C" int __cdecl _wchmod(wchar_t const* const path, int const mode)
+{
+    _VALIDATE_CLEAR_OSSERR_RETURN(path != nullptr, EINVAL, -1);
+
+    WIN32_FILE_ATTRIBUTE_DATA attributes;
+    if (!GetFileAttributesExW(path, GetFileExInfoStandard, &attributes))
+    {
+        __acrt_errno_map_os_error(GetLastError());
+        return -1;
+    }
+
+    // Set or clear the read-only flag:
+    if (mode & _S_IWRITE)
+    {
+        attributes.dwFileAttributes &= ~FILE_ATTRIBUTE_READONLY;
+    }
+    else
+    {
+        attributes.dwFileAttributes |= FILE_ATTRIBUTE_READONLY;
+    }
+
+    if (!SetFileAttributesW(path, attributes.dwFileAttributes))
+    {
+        __acrt_errno_map_os_error(GetLastError());
+        return -1;
+    }
+
+    return 0;
+}